You just answered your own question. How many users click approve without thinking? How many install Xposed modules that intentionally, or unintentionally, create security issues?
I didn’t say rooting will break your security, just that it can. Rooting exponentially increasing the attack surface, which for some users isn’t a concern, but for your average user, it probably should be.
In this case, this person wanted to increase his privacy, which is why I recommended what I did.
Also, FWIW, there’s a reason why GrapheneOS and DivestOS specifically design their ROMS to NOT be rooted and to RELOCK the bootloader.
Might be workable if you settle on combining only 2 to 3 keys (small, medium, large) per hex.
Or, learn metallurgy and material science to find some new polymer or alloy that would be strong enough.
But honestly, it sounds like a really expensive endeavor that even if you made it work, isn’t practical enough to justify the cost.
Maybe something like the universal socket wrench style could influence a design that’s workable as a multi-hex, and be made cheaply enough.